IOSYS(イオシス,ioshisu?) is a Japanese musical ensemble and dōjin circle from Sapporo, Japan. The group is primarily known for producing remixes of music from the Touhou Project series of dōjin games. They are not signed to a label, instead preferring to release their music through dōjin channels such as the Comiket convention and via their website. Their music frequently parodies characters or themes of games such as those of Touhou Project or Atlus's Etrian Odyssey. Many of the current members reside in the Hokkaidō or Kantō areas of Japan.[1]

Contents

IOSYS is generally best known for the Flash movies that go along with their songs, the most widely known of which are "Marisa Stole the Precious Thing (魔理沙は大変なものを盗んでいきました,Marisa wa Taihen na Mono wo Nusundeikimashita?)" and "Stopping at the Diseased Part and Melting Quickly ~ Lunatic Udongein (患部で止まってすぐ溶ける ～ 狂気の優曇華院,Kanbu de Tomatte Sugu Tokeru ~ Kyōki no Udongein?)" (known in English speaking circles as "Overdrive"), both of which are popular on the Japanese Internet forum2channel, Nico Nico Douga and in other otaku internet circles. They also produced the 2nd ending credits for Penguin Musume Heart and composed opening and ending credits music for Yumekui Merry.

The first IOSYS Touhou Project arrangement CD, mainly instrumental. Only the first and fourth tracks having lyrics.

03. 東方乙女囃子 (Tōhō Otomebayashi)

Touhou Maidens' Orchestra

Released Aug 13 2006

The Otome Bayashi includes one of IOSYS' most famous songs, "Marisa Stole the Precious Thing", but is also mainly instrumental.

04. 東方月燈籠 (Tōhō Tsukitōrō)

Touhou Moon Lantern

Released Dec 31 2006

In this CD, "Stops at the affected area and immediately dissolves ~ Lunatic Udongein" is included. This is the first IOSYS CD in which every track has lyrics but the fourteenth. Was re-released in 2009 as Touhou Moon Lantern (Safe), with certain tracks added/removed.

05. 世界樹のおもちゃ箱 (Sekaiju no Omochabako)

Yggdrasil's Toy Box

Released Apr 30/2007

06. 東方永雀峰 (Tōhō Eijanho)

Touhou Eternal Sparrow Peak

Released May 20, 2007

This is a rearrange of nearly the entire Touhou Eiyashou soundtrack, with vocals for only 3 tracks. It also features a parody of Marisa Stole the Precious Thing